Cartridge and heater base for a humidifier



FIG. 1 is a top, front and side perspective view of a cartridge and heater base for a humidifier embodying our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a first side view thereof;

FIG. 5 is a second side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Broken lines are used to illustrate features of the cartridge for a humidifier, which form no part of the claimed design. 

CLAIM The ornamental design for a cartridge and heater base for a humidifier, as shown and described. 